Family POACE® 53 
2. Agrostis asperifolia Trin. Northern Red-top. 
In western part of the state. Belmont; Dismal river; Hat Creek 
basin; Long Pine; Mullen; Plummer Ford; War Bonnet canyon. 
3. Agrostis perennans (Walt.) Tuckerm. 
Agrostis schweinitzii Trin. 
Cass county. 
4. Agrostis hyemalis (Walt.) B. S. P. Hair-grass. 
In prairies over most of the state. The panicle is blown about as a 
tumble-weed. Atkinson; Belmont; Dismal river; Elmwood; Halsey; 
Kearney; Lincoln; Minden; St. James; Thedford. 
2. Calamagrostis. 111. 
Panicle open, the lower branches wide spreading. 1. C. canadensis. 
Panicle contracted, branches ascending. 
Basal hairs about as long as the scale. 2. C. inexpansa. 
Basal hairs half as long as scale. 3. C. neglecta. 
1. Calamagrostis canadensis (Michx.) Beauv. Yellow-top. 
Prairies, not very common. Aten; Kearney; Ord; Platte river; 
Scotia; Whitman. 
2. Calamagrostis inexpansa A. Gray. 
Mullen; along Platte river in Kearney county; Thedford. 
3. Calamagrostis neglecta (Ehrh.) Gaertn. Pony-grass. 
In prairies, most common westwards. Anselmo; Ashland; Atkinson; 
Hat Creek basin; Scotia; Sheridan county; Sioux county; Valley 
county. 
3. Calamovilfa. 114. 
1. Calamovilfa longifolia (Hook.) Hack. Long-leaved Reed-grass. 
Common in the sand-hill regions. Alliance; Antelope county: Ban- 
ner county; Belmont; Culbertson; Dismal river; Franklin; Halsey; 
Mullen; Sioux county; Thomas county; Valentine; Verdigris creek. 
4. Cinna. 108. 
1. Cinna arundinacea L. Wood Reed-grass. 
In woods mostly in the eastern half of the state. Bellevue; Cherry 
county; Hitchcock; Long Pine; Lincoln; Riverton; Talmage; Wahoo; 
Weeping Water. 
5. Sporobolus. 104. 
Drop-seeds. 
Panicle contracted, spike-like. 
Spikelets 4-5 mm. long. 
Panicle over 6 cm. long. 1. S. asper. 
Panicle less than 6 cm. long. 2. S. vagineflorus. 
Spikelets not over 3 mm. long, panicle partly enclosed in the 
sheath. 3. S. neglectus. 
Panicle open, not spike-like. 
Spikelets over 4 mm. long, first scale subulate, often awn-pointed. 
4. S. heterolepis. 
Spikelets 2 mm. long or less. 
poy scales unequal, the first half as long as the second or 
ess. 
First scale half as long as the second, not scabrous keeled. 
5. S. airoides. 
